# year    value 
 1900 -0.6807508 
 1901 -0.7129256 
 1902 -0.8529582 
 1903 -1.114484 
 1904 -0.886421 
 1905 -0.880752 
 1906 -0.7441127 
 1907 -0.7306202 
 1908 -0.780341 
 1909 -0.7484142 
 1910 -0.7047423 
 1911 -0.7051024 
 1912 -0.8952723 
 1913 -0.8655975 
 1914 -0.7872959 
 1915 -0.5886042 
 1916 -0.6317651 
 1917 -0.6916933 
 1918 -0.606858 
 1919 -0.4705696 
 1920 -0.6106655 
 1921 -0.5999022 
 1922 -0.5888932 
 1923 -0.4925118 
 1924 -0.5401292 
 1925 -0.6047272 
 1926 -0.4934934 
 1927 -0.5205643 
 1928 -0.589402 
 1929 -0.6871456 
 1930 -0.5121334 
 1931 -0.6621518 
 1932 -0.6344662 
 1933 -0.6069752 
 1934 -0.5608563 
 1935 -0.5280732 
 1936 -0.5642355 
 1937 -0.5117005 
 1938 -0.5505588 
 1939 -0.4531239 
 1940 -0.5852676 
 1941 -0.5454726 
 1942 -0.532765 
 1943 -0.4902748 
 1944 -0.5095032 
 1945 -0.5004234 
 1946 -0.514785 
 1947 -0.4958082 
 1948 -0.4728808 
 1949 -0.4370631 
 1950 -0.4643111 
 1951 -0.5601769 
 1952 -0.5845052 
 1953 -0.6095073 
 1954 -0.5495188 
 1955 -0.5442078 
 1956 -0.4383249 
 1957 -0.4859426 
 1958 -0.6071922 
 1959 -0.446842 
 1960 -0.5504038 
 1961 -0.5693496 
 1962 -0.6377385 
 1963 -0.6603201 
 1964 -0.9146024 
 1965 -0.7174921 
 1966 -0.6641927 
 1967 -0.7849682 
 1968 -0.8075014 
 1969 -0.7180395 
 1970 -0.590957 
 1971 -0.5210125 
 1972 -0.5861912 
 1973 -0.5805383 
 1974 -0.4807941 
 1975 -0.4912962 
 1976 -0.6441414 
 1977 -0.4800835 
 1978 -0.5063569 
 1979 -0.3446527 
 1980 -0.4128779 
 1981 -0.3642902 
 1982 -0.5700378 
 1983 -0.5684541 
 1984 -0.5109832 
 1985 -0.4584798 
 1986 -0.319139 
 1987 -0.2366504 
 1988 -0.2889293 
 1989 -0.09005215 
 1990 -0.1883936 
 1991 -0.397395 
 1992 -0.5793173 
 1993 -0.3758596 
 1994 -0.2166497 
 1995 -0.183437 
 1996 0.03162709 
 1997 -0.03414802 
 1998 0.05262773 
 1999 0.04800038 
 2000 0.1499552 
 2001 0.2552915 
 2002 0.1449932 
 2003 0.2372699 
 2004 0.2023061 
 2005 0.3105794